Ossan's Love Thailand revolves around a young and unlucky-in-love property consultant, Heng. He suddenly finds his world turned upside down when he becomes entangled in a chaotic love triangle. His boss, Kongdech, and his coworker and housemate, Mo, both develop feelings for him, throwing his life into turmoil. To make things even more complicated, his childhood friend Chicha unexpectedly confesses her love for him as well.

Amid this whirlwind of emotions and tangled relationships, who will ultimately win Heng's heart?